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3 Dear Valued Customer, Thank you for choosing Listen! All of us at Listen are dedicated to provide you with the highest quality products available. We take great pride in their outstanding performance because we care that you are completely satisfied. That s why we independently certify them to the highest quality standards and back them with a limited lifetime guarantee. We stand ready to answer any questions you might have during installation or in the operation of our products. Should you experience any problems whatsoever with your Listen products, we are ready to help you in any way we can with prompt, efficient customer care. Because at Listen, it s all about you! And should you have any comments on how we might improve our products or our service, we re here to listen North America fax Thank you... and enjoy your listening experience! Best regards, The Listen Team

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5 Receivers Table of Contents LR-500 User s Manual 3 LR-500 Table of Contents 7 LR-400 User s Manual 27 LR-400 Table of Contents 31 LR-300 User s Manual 51 LR-300 Table of Contents 55 Supplementary Information 71 Channel Selection 73 Listen SQ 75 RF Reception Maximization Strategies MHz Frequency Compatibility Table MHz Frequency Compatibility Table 79 Optional Accessories 81 Troubleshooting 83 Compliance Notice 86 FCC Statement 87 Warranty 88 Contacting Listen 89 Table of Contents LR-500 LR-400 LR-300 Information

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9 LR-500 Package Contents LR-500 (72 MHz or 216 MHz) Warranty Card Receiver User Manual Part Number 72 MHz: LR MHz: LR LR-500 Optional Accessories See pages

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11 LR-500 Table of Contents Architectural Specifications 9 Specifications 9 Quick Reference 11 Setup Instructions 14 Operation Instructions 17 Programming Instructions 19 Squelch Information 20 Squelch Programming 21 Charging Batteries 22 Wall Transformer Operation 24 LR-500 Supplementary Information 71 Channel Selection 73 Listen SQ 75 RF Reception Maximization Strategies MHz Frequency Compatibility Table MHz Frequency Compatibility Table 79 Optional Accessories 81 Troubleshooting 83 Compliance Notice 86 FCC Statement 87 Warranty 88 Contacting Listen 89

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13 LR-500 Specifications Architectural Specifications The FM reciever shall be capable of receiving on 57 wide and narrow band channels with a SNR of 80dB or greater. The receiver shall be programmable to electronically lock out unneeded channels. The receiver shall be capable of seeking channels. The device shall have an adjustable squelch. The device shall have an audio frequency response of 63 Hz to 15 KHz, ± 3dB at 72 MHz, or 63 Hz to 10 KHz, ±3dB at 216 MHz. The device will incorporate a stereo headset jack that allows the user to plug in either a mono or stereo headset. The device shall incorporate an LCD display that indicates channel, channel lock or lock status, battery level, battery charging, and RF signal strength. The receiver shall incorporate automatic battery charging circuitry for recharging of NiMH batteries. The Listen LR-500 is specified. LR-500 Specifications RF Audio Specification LR LR RF Frequency Range MHz MHz Number of Channels 57 (17 wide, 40 narrow) 57 (19 wide, 38 narrow) Sensitivity.6uV typical, 1 uv maximum for 12dB SINAD Frequency Accuracy ±.005% stability 32 to 122º F (0 to 50º C) Antenna Antenna Connector Squelch Compliance Uses earphone cable 3.5 mm connector Programmable in 20 steps FCC Part 15, Industry Canada ** All system specifications are wireless end-to-end System Frequency Response 63 Hz-15 Hz (±3dB) 63 Hz-10 khz (±3dB) System Signal to Noise Ratio (A-weighted) System Distortion Output SQ enabled: 80dB; SQ disabled: 60dB SQ enabled: 80dB; SQ disabled: 50dB < 2% total harmonic distortion (THD) at 80% deviation 3.5 mm connectors, unbalanced, 0dBu nomial output level, 16mW maximum, impedance 32 Ohms continued on next page

14 LR-500 Specifications LR-500 Controls Specification LR LR Programmable channel selection (see below), alkaline/nimh batteries and squelch, SQ Set Up Controls enable/disable User Controls Programming Volume, channel UP/DOWN/SEEK. All controls except volume are electronically lockable Unit can be programmed so that only desired channels are displayed. Squelch can be adjusted for sensitivity and signal capture control. Channel selection can be locked by holding the SEEK button for 5 seconds. Indicators Power LCD Display LED Battery Type Battery Life (Listen batteries) Battery Charging (NiMH only) Power Supply Connector Compliance Indicates channel, RF signal strength, lock status, squelch, battery power level and channel programming Red, illuminates when unit is on. Flashes when batteries are low. Flashes when charging. Flashes when locked and user attempts to seek to another channel. Two AA batteries, alkaline or NiMH 30 hours alkaline (LA-361), 15 hours NiMH rechargeable (LA-362) Fully automatic, 14 hours 2.3 mm OD by 0.7 mm ID, barrel type connector. 7.5VDC, center positive <250mA. Drop in contact points for use with Listen charging cases UL Listed Physical Environmental Dimensions W x D x H Unit Weight 3.9 oz. (111 g) Unit Weight with batteries 5.8 oz. (164.4 g) Shipping Weight Door 3.0 x 1.0 x 4.25 in. (7.6 x 2.5 x 13 cm) 1.0 lbs. (453.6 kg) Temperature - Operation 14 to 104º F (10 to 40º C) Temperature - Storage -4 to 122º F (-20 to 50º C) Humidity Manually lockable. UP, DOWN and SEEK through door, other controls behind door (see Controls above) 0 to 95% relative humidity, non-condensing 10

15 LR-500 Quick Reference LR-500 Front 3.5mm Input Jack: A Listen earpiece or headset connects here. LED: When lit, indicates unit has power. On/Off and Volume control dial LR-500 Look&Listen Display: Shows receive level, channel, battery status, PROGRAM mode, whether a channel is locked, and whether a channel is locked out from selection (PROGRAM mode). See close-up on page 13. Adjustable Squelch: The default factory preset for squelch is 03.(See page 21 for Squelch programming information). Up and Down Buttons: Use to select a channel and access program mode.press and hold both buttons for 5 seconds to enter PROGRAM mode. The PGM icon will appear in the display. To exit PROGRAM, let unit sit idle for 5 seconds. Seek Button: Allows the user to change channels or to lock on a channel. 11

16 LR-500 Quick Reference LR-500 Inside Access Door LR-500 Top of Unit LR-500 Battery Select Switch SQ Switch LED indicators: Steady Red: Normal operation Slow Flashing: Battery is low Slow Flashing while charging: Unit is charging Battery Select Switch: Place in NiMH position ONLY if you are using Nickel Metal Hydride batteries, otherwise, leave it in the Alkaline position. SQ Switch: Shipped in the ON position, use a screwdriver or pen to slide to the OFF position if needed. You should turn SQ off if any of your receivers do not have SQ. 3.5mm Input Jack: A Listen earpiece or headset connects here. On/Off and Volume control dial: Rotate the dial counter-clockwise to turn unit on and increase volume. 12

17 LR-500 Quick Reference LR-500 Look&Listen Display Dots indicate the relative RF signal strength. Indicates the currently tuned channel Indicates the unit is in PROGRAM mode. To enter PROGRAM mode, press and hold the UP and DOWN keys until the PGM icon appears in the display. To exit PROGRAM mode let unit sit idle for 5 seconds. See page 19 for complete instructions. When the padlock is visible the unit is locked on channel currently displayed. Press and hold SEEK for 5 seconds to unlock or lock. The battery level indicator flashes, along with the red LED on top of the unit, to alert you when the battery is low and needs to be charged or changed. While in Program mode, the L/O symbol indicates that a channel is locked out and will not be available to the user. Press SEEK to toggle channels between Locked Out and non-locked Out modes. LR-500 LR-500 Battery Indicator All three segments showing: The batteries are at 50% or greater capacity. Two segments showing: The batteries are at 25-49% capacity. One segment showing: Your batteries less than 25% capacity. When this segment begins flashing along with the LED on top of the unit, you should immediately change your batteries or recharge them (if using NiMH batteries). 13

18 LR-500 Setup Instructions LR Remove the product Remove outer packaging and plastic cover. Inspect for physical damage. If damage is apparent, please contact Listen Technologies Corporation technical support for assistance. See page 89 for contact information. 2 Open the front access door If locked, use a pocketknife or small screwdriver to unlock the door locks on both sides of the unit. To unlock the door, rotate the lock ¼ turn counterclockwise. Grip the two tabs with your thumb and index finger and pull the door downward. DO NOT place batteries in the unit yet. 3 Select Battery Type See diagram on page 12. You have two choices: NiMH and Alkaline. The unit is shipped with the switch in the Alkaline position. Use a pen or small screwdriver to select the battery type. Unlocked Locked WARNING: Do not place the BATTERY switch in the NiMH position if you are not using Nickel Metal Hydride Batteries. The NiMH position will attempt to charge any batteries in the unit, even if they are not the proper type. Charging non-nickel Metal Hydride (NiMH) batteries will result in physical harm, destruction of property and/or fire. 14

19 LR-500 Setup Instructions CAUTION: If you are using any battery type other than rechargeable Nickel Metal Hydride (NiMH) batteries, make sure the BATTERY selection switch is in the alkaline position. 4 5 Set SQ switch The SQ switch is inside the battery compartment next to the Battery Select switch. The unit is shipped with SQ in the ON position. To turn it off, use a small screwdriver or pen to slide the switch to the OFF position (to the right). See page 75 for more information on SQ. Place Batteries in Unit Place two AA batteries in the compartment, making note of the battery polarity shown in the battery compartment, and again verifying that the BATTERY SELECT switch is in the correct position for the batteries you are using. (Alkaline should be selected for all battery types other than NiMH). Battery Select Switch SQ Select Switch LR-500 NOTE: Listen provides industrial strength AA alkaline batteries (part number LA-361) and high performance AA Nickel Metal Hydride batteries (part number LA-362). These may be purchased from your Listen dealer. 15

20 LR-500 Setup Instructions LR Connect an Earphone or Headset Your headset or earphone will connect to the jack on the top of the unit. Either mono or stereo connectors may be used with a Listen receiver. Make certain you push the plug all the way into the jack. Turn the Unit On Receivers are turned on by rotating the Earphone/Headset jack volume dial counterclockwise. The red LED on top of the unit should activate and the LCD display should illuminate. If they do not, make sure you have installed the batteries correctly and that you are using fully charged batteries. Red LED will illuminate when on Turn volume knob counterclockwise to turn on 8 Select Channel(s) See page 73 for complete channel selection information. LCD display will activate when on 9 10 Set Squelch See pages 20 and 21 for squelch and programming information. Program Channels see page

21 LR-500 Operation Instructions 1 2 Make Sure the Unit is On Rotate the volume knob counterclockwise with an earphone or headset connected to the unit. Listen receivers use the cable of the earphone or headset as a receiving antenna. Be careful when turning the unit on - if you turn the knob too far you might get too much volume in your earphone! Select a Channel Select the channel to match the transmission channel by pressing the UP and DOWN buttons on the receiver. Listen recommends the use of wide band channels. LR At 72 MHz: 72 MHz receivers operate on 17 wide band channels and 40 narrow band channels. Channels represented by letters on the display (i.e. A) are wideband channels; channels represented by numbers are narrowband channels. At 216 MHz: 216 MHz receivers operate on 19 wide band channels and 38 narrow band channels. Channel numbers starting with a 2 are wide band; channels beginning with a 1 or 3 are narrow band channels. Refer to the Frequency Compatibility Tables (pages 77-80) for specific frequencies and compatibility with other manufacturers. Test the audio If a transmitter is broadcasting on that channel, you will be able to hear the audio. If the signal is too weak, the audio will be muted (squelched). 17

22 LR-500 Operation Instructions LR Find an audio transmission using SEEK Another way to find a channel on the LR-500 is to use the SEEK button. When you do this, the Listen receiver looks for the next active channel. Sometimes the unit will mistake interference for a real broadcast signal. If you get interference, press the SEEK button again. The unit may stop on a channel that is close to the actual broadcast channel, in which case the channel will sound noisy or distorted. Simply press SEEK again until you find the clearest operating channel. 5 6 Adjust the volume control Use the control dial on the top of the unit to adjust the volume to a comfortable level. To Lock into Only One Channel Press and hold the SEEK button for 5 seconds to lock a receiver onto the currently tuned channel. Press and hold the button again to unlock. When locked the LED on top of the unit will flash when you press the SEEK button. Is the Channel Locked on My Receiver? On the LR-500, when the channel is locked, the padlock icon will appear on the display. If the unit is locked, the red LED on the top of the unit will flash when you press the SEEK button. Padlock appears when locked If locked, LED flashes on all portable receivers when SEEK button is pressed. 18

23 LR-500 Programming Instructions The LR-500 Display Receiver has some special features not available in the other receivers: you may lock out unwanted channels, and you can adjust the squelch in the unit. Locking Out Unwanted Channels For applications where users are required to select a channel (such as language interpretation or classrooms), and you don t want them to have to go through all 57 available channels to find the appropriate channel, you can lock out all channels except the ones you are using in your facility. Enter the PROGRAM mode Press the UP and DOWN buttons simultaneously for 5 seconds, until the PGM symbol appears in the display. Use the UP and DOWN keys to select channels As channels are displayed on the unit, those channels that are locked out from user access will be indicated by the L/O (Locked Out) symbol. When a channel is locked out, the receiver will skip over that channel when a user is tuning the receiver. UP and DOWN buttons on front of LR-500 Press the SEEK button to toggle channels between locked out and non-locked out modes LR-500 Exiting PROGRAM mode To exit the PROGRAM mode, let the receiver sit idle (don t press any buttons) for 5 seconds. The receiver will automatically return to normal operation. If you haven t finished programming the unit and it automatically exits, press and hold the UP & DOWN buttons simultaneously for 5 seconds to re-enter the PROGRAM mode. 19

24 LR-500 Squelch LR-500 Squelch The purpose of squelch is to mute the audio output of your receiver when the signal from the transmitter is turned off or is too weak to be received. Without squelch you would hear radio noise in your earphone. The squelch on your receiver can be adjusted so that it will mute the audio on different RF signal strengths. This is useful as follows: To ensure that users don t hear transmissions from other transmitters, set the squelch setting to the highest level that doesn t squelch the receiver. If the receiver is going to be close to the transmitter (i.e. in a classroom), setting the squelch setting high so that when the transmitter is turned off it immediately squelches and ignores transmitters in other rooms. If you are in an area that has a lot of inference, you may want to set the squelch setting to a high setting to ensure the interference is not picked by the receiver. If you need the maximum amount of range, you may want to consider setting the squelch setting to a low level (0, 1 or 2). CAUTION: When setting the squelch level low the reliability of squelch function is comprised. This will cause radio noise to be heard in the earphone and there is a possibility of hearing damage. 20

25 Squelch Programming Instructions Squelch Programming To enter Squelch programming mode Turn the unit off Press and hold the seek button; while still holding seek turn the ON/OFF dial to turn the unit on. Release the seek button when the Listen name disappears and a two digit display is seen. To adjust the Squelch level Use the Channel UP and DOWN buttons to raise or lower the squelch sensitivity settings. Lower numbers mean that a less powerful and possibly noisy signal will be heard, but you can have a longer range. Higher numbers mean that a more powerful signal with no noise will be heard, but you may have a shorter range. Once the desired squelch setting is found, press seek to exit the squelch programming mode. LR-500 Squelch setting 00 is no squelch; this effectively disables Squelching capabilities of the receiver. Squelch setting 20 is maximum squelch sensitivity; you must have a very strong and stable RF signal for the unit to not engage the squelch feature. Adjusting the squelch setting will keep your LR-500 receiver from picking up noise when the transmitter is not transmitting, or when you lose the signal by being out of range or if encountering interference. Note: For squelch settings 1-3, the squelch function is slow which allows for maximum transmission range. For squelch settings 4-20 the squelch function is fast to ensure little radio noise is heard during the squelch function. (The Listen SQ feature is not squelch, please refer to page 75 for information on Listen SQ ). 21

26 LR-500 Charging Batteries The LR-500 and all Listen receivers are unique because they have SmartCharge chargers built in. When any of these units are connected to an LA-202 wall transformer or dropped into a Listen charging case, NiMH batteries will be charged. LR To charge the batteries using the LA-202 wall transformer, plug the transformer into the jack marked PWR/CHG on the side of the unit. The unit can be operated while the batteries are charging. Connect LA-202 here and plug it into an AC wall outlet. 2 To charge the batteries using a drop-in charger, simply place the unit into a slot in the charger and connect the charger to power. Make sure the unit is fully seated in its slot. SmartCharge uses a pulse charging, which greatly extends the life of Nickel Metal Hydride (NiMH) batteries. The entire charging process takes 13 hours. Listen recommends that you allow the charger to complete its full cycle every time for maximum battery life. NOTE: In order to charge NiMH batteries, the BATTERY SELECT switch in your Listen product must be set to the NiMH setting. Use a pen or small screwdriver to move the switch (located in the battery compartment) to the proper position. IMPORTANT: DO NOT ATTEMPT TO CHARGE ANY TYPE OF BATTERY OTHER THAN NiMH (NICKEL METAL HYDRIDE) with your Listen equipment. Alkaline batteries may explode when connected to a charger. Other risks of charging non-nimh batteries include destruction of property or fire. 22

27 LR-500 Charging Batteries During the charge cycle, the red LED on top of the Listen product will flash slowly. When charging is completed, the LED will turn off. It is not necessary to unplug the charger; however, if you unplug the unit from the charger and then plug it back in, it will begin the 13-hour charge cycle over again. When not using the LR-500, it is recommended to leave the unit on the charger. The charger provides a maintenance charge that keeps the battery at 100%. If the unit is not on the charger, the battery will lose up to 20% of its charge per month. LR-500 NOTE: Listen provides high performance constant current NiMH (Nickel Metal Hydride) batteries. These may be purchased from your Listen dealer (ask for part number LA-362). One of several charging cases available from Listen. See for more options. LA unit Drop In Charging Case shown 23

28 LR-500 Wall Transformer Operation The LR-500 will operate normally when connected to a wall transformer. Use Listen part number LA-202, available from any Listen dealer. Connect the wall transformer to the jack on the side of the LR-500 marked PWR/CHG and plug the wall transformer into a grounded AC outlet. LR-500 You do not need to have batteries installed in the LR-500 to operate it with a wall transformer. NOTE: If batteries are in the unit ensure that the battery selection switch is set properly as shown on page 12. Please review the information on page 22 for important information regarding battery type and charging. The LA-202 wall transformer plugs into the side of your portable transmitter or receiver. 24

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33 LR-400 Package Contents LR-400 (72 MHz or 216 MHz) Warranty Card Part Number 72 MHz: LR MHz: LR Receiver User Manual LR-400 Optional Accessories See pages

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35 LR-400 Table of Contents Architectural Specifications 33 Specifications 33 Quick Reference 35 Setup Instructions 38 Operation Instructions 41 Squelch Information 43 Squelch Programming 44 Charging Batteries 45 Wall Transformer Operation 47 Supplementary Information 71 Channel Selection 73 Listen SQ 75 RF Reception Maximization Strategies MHz Frequency Compatibility Table MHz Frequency Compatibility Table 79 Optional Accessories 81 Troubleshooting 83 Compliance Notice 86 FCC Statement 87 Warranty 88 Contacting Listen 89 LR-400

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37 LR-400 Specifications Architectural Specifications The FM receiver shall be capable of receiving on 57 wide and narrow band channels with a SNR of 80dB or greater. The receiver shall be capable of seeking channels. The device shall have an adjustable squelch. The device shall have an audio frequency response of 63 Hz to 15 KHz, ± 3dB at 72 MHz, or of 63 Hz to 10 khz, ± 3dB at 216 MHz. The device will incorporate a stereo headset jack that allows the user to plug in either a mono or stereo headset and listen to the audio normally. The device shall incorporate an LCD display that indicates channel, battery level, low battery, battery charging, RF signal strength and channel lock status. The receiver shall incorporate automatic battery charging circuitry for recharging of NiMH batteries. The Listen LR-400 is specified. Specifications RF Specification LR LR RF Frequency Range MHz MHz Number of Channels 57 (17 wide, 40 narrow) 57 (19 wide, 38 narrow) Sensitivity.6uV typical, 1 uv maximum for 12dB SINAD Frequency Accuracy ±.005% stability 32 to 122º F (0 to 50º C) Antenna Uses earphone cable Antenna Connector 3.5 mm connector Squelch Programmable in 20 steps Compliance FCC Part 15, Industry Canada LR-400 Audio ** All system specifications are wireless end-to-end System Frequency Response 63 Hz-15 Hz (±3dB) 63 Hz-10 khz (±3dB) System Signal to Noise Ratio (A-weighted) System Distortion Output SQ enabled: 80dB; SQ disabled: 60dB SQ enabled: 80dB; SQ disabled: 50dB < 2% total harmonic distortion (THD) at 80% deviation 3.5 mm connectors, unbalanced, 0dBu nomial output level, 16mW maximum, impedance 32 Ohms continued on next page 33

38 LR-400 Specifications Controls Specification LR LR Set Up Controls Alkaline/NiMH batteries and SQ enable/disable and programmable squelch setting User Controls Programming Volume, channel UP/DOWN/SEEK (All controls except volume are electronically lockable, and are behind the door) Squelch can be adjusted for sensitivity and signal capture control. Channel selection can be locked by holding the SEEK button for 5 seconds. Unit cannot be programmed to seek only used channels, however, it is capable of entering squelch mode. Indicators LCD Display LED Indicates channel, RF signal strength, lock status, and squelch setting Red, illuminates when unit is on. Flashes when batteries are low. Flashes when charging. Flashes when locked and user attempts to seek to another channel. LR-400 Power Battery Type Battery Life (Listen batteries) Battery Charging (NiMH only) Power Supply Connector Two AA batteries, alkaline or NiMH 30 hours alkaline (LA-361), 15 hours NiMH rechargeable (LA-362) Fully automatic, 14 hours 2.3 mm OD by 0.7 mm ID, barrel type connector. 7.5VDC, center positive <250mA. Drop in contact points for use with Listen charging/carrying cases Compliance UL Listed Physical Environmental Dimensions W x D x H 3.0 x 1.0 x 4.25 in. (7.6 x 2.5 x 13 cm) Unit Weight 3.9 oz. (111 g) Unit Weight with batteries 5.8 oz. (164.4 g) Shipping Weight 1.0 lbs. (453.6 kg) Door Manually lockable. UP, DOWN and SEEK protected by door Temperature - Operation 14 to 104º F (10 to 40º C) Temperature - Storage -4 to 122º F (-20 to 50º C) Humidity 0 to 95% relative humidity, non-condensing 34

39 LR-400 Quick Reference LR-400 Front LED: When lit, indicates On/Off and Volume unit has power. control dial 3.5mm Input Jack: A Listen earpiece or headset connects here. LR-400 Top of Unit LED indicators: Steady Red: Normal operation Slow Flashing: Battery is low Slow Flashing while charging: Unit is charging Look&Listen Display: Shows receive level, channel, battery status, and whether a channel is locked. See close-up on page mm Input Jack: A Listen earpiece or headset connects here. LR On/Off and Volume control dial: Rotate the dial counter-clockwise to turn unit on and increase volume. 35

40 LR-400 Quick Reference LR-400 Inside Access Door Up and Down buttons: Used to select a channel. SEEK button: Allows the user to change channels or to lock on a channel. LR-400 Adjustable Squelch: The default factory preset for squelch is 03.(See page 44 for Squelch programming information) Battery Select Switch: Place in NiMH position ONLY if you are using Nickel Metal Hydride batteries, otherwise, leave it in the Alkaline position. SQ Switch: Shipped in the ON position, use a screwdriver or pen to slide to the OFF position if needed. You should turn SQ off if any of your receivers do not have SQ. 36

41 LR-400 Quick Reference LR-400 Look&Listen Display Dots indicate the relative RF signal strength. When there is a full signal the unit will display all 8 dots. Indicates the currently tuned channel When the padlock is visible, the channel is locked. Press and hold SEEK for 5 seconds to unlock or lock. Battery level indicator. The indicator flashes, along with the red LED on top of the unit, to alert you when the battery is low and needs to be charged or changed. LR-400 LR-400 Battery Indicator All three segments showing: The batteries are at 50% or greater capacity. Two segments showing: The batteries are at 25-49% capacity. One segment showing: Your batteries less than 25% capacity. When this segment begins flashing along with the LED on top of the unit, you should immediately change your batteries or recharge them (if using NiMH batteries). 37

42 LR-400 Setup Instructions 1 Remove the product Remove outer packaging and plastic cover. Inspect for physical damage. If damage is apparent, please contact Listen Technologies Corporation technical support for assistance. See page 89 for contact information. LR Open the front access door If locked, use a pocketknife or small screwdriver to unlock the door locks on both sides of the unit. To unlock the door, rotate the lock ¼ turn counterclockwise. Grip the two tabs with your thumb and index finger and pull the door downward. DO NOT place batteries in the unit yet. 3 Select Battery Type See diagram on page 36. You have two choices: NiMH and Alkaline. The unit is shipped with the switch in the Alkaline position. Use a pen or small screwdriver to select the battery type. Unlocked Locked WARNING: Do not place the BATTERY switch in the NiMH position if you are not using Nickel Metal Hydride Batteries. The NiMH position will attempt to charge the batteries. Charging non-nickel Metal Hydride batteries may result in physical harm, destruction of property and/or fire. 38

43 LR-400 Setup Instructions CAUTION: If you are using any battery type other than rechargeable Nickel Metal Hydride (NiMH) batteries, make sure the BATTERY selection switch is in the alkaline position. 4 Set SQ switch The SQ switch is inside the battery compartment next to the Battery Select switch. The unit is shipped with SQ in the ON position. To turn it off, use a small screwdriver or pen to slide the switch to the OFF position (to the right). See page 75 for more information on SQ. Battery Select Switch SQ Select Switch 5 Place Batteries in Unit Place two AA batteries in the compartment, making note of the battery polarity shown in the battery compartment, and again verifying that the BATTERY SELECT switch is in the correct position for the batteries you are using. (ALK should be selected for all battery types other than NiMH). LR NOTE: Listen provides industrial strength AA alkaline batteries (part number LA-361) and high performance AA Nickel Metal Hydride batteries (part number LA-362). These may be purchased from your Listen dealer. Connect an Earphone or Headset Your headset or earphone will connect to the jack on the top of the unit. Either mono or stereo connectors may be used with a Listen receiver. Make certain you push the plug all the way into the jack. 39

44 LR-400 Setup Instructions LR Turn the Unit On Receivers are turned on by rotating the volume dial counterclockwise. The red LED on top of the unit should activate and the LCD display should illuminate. If they do not, make sure you have installed the batteries correctly and that you are using fully charged batteries. Select Channel(s) See page 73 for complete channel selection information. Set Squelch See pages 43 and 44 for squelch and programming information. Earphone/Headset jack LCD display will activate when on Red LED will illuminate when on Turn volume knob counterclockwise to turn on 40

45 LR-400 Operation Instructions 1 2 Make Sure the Unit is On Rotate the volume knob counterclockwise with an earphone or headset connected to the unit. Listen receivers use the cable of the earphone or headset as a receiving antenna. Be careful when turning the unit on - if you turn the knob too far you might get too much volume in your earphone! Select a Channel Select the channel to match the transmission channel by pressing the UP and DOWN buttons on the receiver. Listen recommends the use of wideband channels. At 72 MHz: 72 MHz receivers operate on 17 wide band channels and 40 narrow band channels. Channels represented by letters on the display (i.e. A) are wideband channels; channels represented by numbers are narrowband channels. LR-400 At 216 MHz: 216 MHz receivers operate on 19 wide band channels and 38 narrow band channels. Channel numbers starting with a 2 are wide band; channels beginning with a 1 or 3 are narrow band channels. Refer to the Frequency Compatibility Tables (pages 77-80) for specific frequencies and compatibility with other manufacturers. 3 Test the audio If a transmitter is broadcasting on that channel, you will be able to hear the audio. If the signal is too weak, the audio will be muted (squelched). 41

46 LR-400 Operation Instructions 4 Find an audio transmission using SEEK Another way to find a channel on the LR-400 is to use the SEEK button. When you do this, the Listen receiver looks for the next active channel. Sometimes the unit will mistake interference for a real broadcast signal. If you get interference, press the SEEK button again. The unit may stop on a channel that is close to the actual broadcast channel, in which case the channel will sound noisy or distorted. Simply press SEEK again until you find the clearest operating channel. LR Adjust the volume control Use the control dial on the top of the unit to adjust the volume to a comfortable level. To Lock into Only One Channel Press and hold the SEEK button for 5 seconds to lock a receiver onto the currently tuned channel. Press and hold the button again to unlock. When locked the LED on top of the unit will flash when you press the SEEK button. Is the Channel Locked on My Receiver? On the LR-400, when the channel is locked, the padlock icon will appear on the display. If the unit is locked, the red LED on the top of the unit will flash when you press the SEEK button. If locked, LED flashes on all portable receivers when SEEK button is pressed. Padlock appears when locked 42

47 LR-400 Squelch Squelch The purpose of squelch is to mute the audio output of your receiver when the signal from the transmitter is turned off or is too weak to be received. Without squelch you would hear radio noise in your earphone. The squelch on your receiver can be adjusted so that it will mute the audio on different RF signal strengths. This is useful as follows: To ensure that users don t hear transmissions from other transmitters, set the squelch setting to the highest level that doesn t squelch the receiver. If the receiver is going to be close to the transmitter (i.e. in a classroom), setting the squelch setting high so that when the transmitter is turned off it immediately squelches and ignores transmitters in other rooms. If you are in an area that has a lot of inference, you may want to set the squelch setting to a high setting to ensure the interference is not picked by the receiver. If you need the maximum amount of range, you may want to consider setting the squelch setting to a low level (0, 1 or 2). CAUTION: when setting the squelch level low the reliability of squelch function is comprised. This will cause radio noise to be heard in the earphone and there is a possibility of hearing damage. LR

48 Squelch Programming Instructions LR-400 Squelch Programming To enter Squelch programming mode Turn the unit off Press and hold the seek button; while still holding seek turn the ON/OFF dial to turn the unit on. Release the seek button when the Listen name disappears and a two digit display is seen. To adjust the Squelch level Use the Channel UP and DOWN buttons to raise or lower the squelch sensitivity settings. Lower numbers mean that a less powerful and possibly noisy signal will be heard, but you can have a longer range. Higher numbers mean that a more powerful signal with no noise will be heard, but you may have a shorter range. To save and exit the squelch programming mode press the seek button. Squelch setting 00 is no squelch; this effectively disables Squelching capabilities of the receiver. Squelch setting 20 is maximum squelch sensitivity; you must have a very strong and stable RF signal for the unit to not engage the squelch feature. Adjusting the squelch setting will keep your LR-400 receiver from picking up noise when the transmitter is not sending audio, or when you lose the signal by being out of range or if encountering interference. Note: For squelch settings 1-3, the squelch function is slow which allows for maximum transmission range. For squelch settings 4-20 the squelch function is fast to ensure little radio noise is heard during the squelch function. (The Listen SQ feature is not squelch, please refer to page 75 for information on Listen SQ ). 44

49 LR-400 Charging Batteries The LR-400 and all Listen receivers are unique because they have SmartCharge chargers built in. When any of these units are connected to an LA-202 wall transformer or dropped into a Listen charging case, NiMH batteries will be charged. outlet. To charge the batteries using the LA-202 wall transformer, plug the transformer into the jack marked PWR/CHG on the side of the unit. The unit can be operated while the batteries are charging. Connect LA-202 here and plug it into an AC wall To charge the batteries using a drop-in charger, simply place the unit into a slot in the charger and connect the charger to power. Make sure the unit is fully seated in its slot. SmartCharge uses a pulse charging, which greatly extends the life of Nickel Metal Hydride (NiMH) batteries. The entire charging process takes 13 hours. Listen recommends that you allow the charger to complete its full cycle every time for maximum battery life. LR-400 NOTE: In order to charge NiMH batteries, the BATTERY SELECT switch in your Listen product must be set to the NiMH setting. Use a pen or small screwdriver to move the switch (located in the battery compartment) to the proper position. IMPORTANT: DO NOT ATTEMPT TO CHARGE ANY TYPE OF BATTERY OTHER THAN NiMH (NICKEL METAL HYDRIDE) with your Listen equipment. Alkaline batteries may explode when connected to a charger. Other risks of charging non-nimh batteries include destruction of property or fire. 45

50 LR-400 Charging Batteries During the charge cycle, the red LED on top of the Listen product will flash slowly. When charging is completed, the LED will turn off. It is not necessary to unplug the charger; however, if you unplug the unit from the charger and then plug it back in, it will begin the 13-hour charge cycle over again. When not using the LR-400, it is recommended to leave the unit on the charger. The charger provides a maintenance charge that keeps the battery at 100%. If the unit is not on the charger, the battery will lose up to 20% of its charge per month. LR-400 NOTE: Listen provides high performance constant current NiMH (Nickel Metal Hydride) batteries. These may be purchased from your Listen dealer (ask for part number LA-362). One of several charging cases available from Listen. See the for more options. LA unit Drop In Charging Case shown 46

51 LR-400 Wall Transformer Operation The LR-400 will operate normally when connected to a wall transformer. Use Listen part number LA-202, available from any Listen dealer. Connect the wall transformer to the jack on the side of the LR-400 marked PWR/CHG and plug the wall transformer into a grounded AC outlet. You do not need to have batteries installed in the LR-400 to operate it with a wall transformer. NOTE: If batteries are in the unit ensure that the battery selection switch is set properly as shown on page 36. Please review the information on page 45 for important information regarding battery type and charging. The LA-202 wall transformer plugs into the side of your portable transmitter or receiver. LR

52 Notes

53 Notes

54

55

56

57 LR-300 Package LR-300 (72 MHz) Contents Part Number 72 MHz: LR Warranty Card Receiver User Manual Optional Accessories See pages LR

58

59 LR-300 Table of Contents Architectural Specifications 57 Specifications 57 Quick Reference 59 Setup Instructions 61 Operation Instructions 63 Charging Batteries 65 Wall Transformer Operation 67 Supplementary Information 71 Channel Selection 73 Listen SQ 75 RF Reception Maximization Strategies MHz Frequency Compatibility Table MHz Frequency Compatibility Table 79 Optional Accessories 81 Troubleshooting 83 Compliance Notice 86 FCC Statement 87 Warranty 88 Contacting Listen 89 LR-300

60

61 LR-300 Specifications Architectural Specifications The FM receiver shall be capable of receiving on 17 wide band channels and have a SNR of 80dB or greater. The receiver shall be capable of seeking channels. The device shall have a squelch. The device shall have an audio frequency response of 63 Hz to 15 KHz, ± 3dB at 72 MHz. The device shall incorporate a stereo headset jack that allows the user to plug in either a mono or stereo headset and listen to audio normally. The receiver shall incorporate automatic battery charging circuitry for recharging of NiMH batteries. The Listen LR-300 is specified. Specifications RF Audio Specification RF Frequency Range Number of Channels Sensitivity MHz 17 (wide band) LR uV typical, 1 uv maximum for 12dB SINAD Frequency Accuracy ±.005% stability 32 to 122º F (0 to 50º C) Antenna Antenna Connector Squelch Compliance System Frequency Response System Signal to Noise Ratio (A-weighted) System Distortion Output Uses earphone cable 3.5 mm connector Automatic on loss of RF signal FCC Part 15, Industry Canada ** All system specifications are wireless end-to-end 63 Hz-15 khz (± 3dB) SQ enabled: 80dB; SQ disabled 60dB < 2% total harmonic distortion (THD) at 80% deviation 3.5 mm connectors, unbalanced, 0dBu nomial output level, 16mW maximum, impedance 32 Ohms LR-300 continued on next page 57

62 LR-300 Specifications Controls Indicators Power Specification Set Up Controls User Controls Programming LED Battery Type Battery Life (Listen batteries) Battery Charging (NiMH only) Power Supply Connector Compliance LR Alkaline/NiMH batteries, SQ enable/disable Volume, SEEK (Channel SEEK is electronically lockable) Channel selection can be locked by holding the SEEK button for 5 seconds Red, illuminates when unit is on. Flashes when batteries are low. Flashes when charging. Flashes when locked and user attempts to seek to another channel. Two AA batteries, alkaline or NiMH 30 hours alkaline (LA-361), 15 hours NiMH rechargeable (LA-362) Fully automatic, 14 hours 2.3 mm OD by 0.7 mm ID, barrel type connector. 7.5VDC, center positive <250mA. Drop in contact points for use with Listen charging cases UL Listed Physical Dimensions W x D x H 3.0 x 1.0 x 4.25 in. (7.6 x 2.5 x 13 cm) Unit Weight 3.9 oz. (111 g) Unit Weight with batteries 5.8 oz. (164.4 g) Shipping Weight 1.0 lbs. (453.6 kg) Door Manually lockable. SEEK behind the door. LR-300 Environmental Temperature - Operation 14 to 104º F (10 to 40º C) Temperature - Storage -4 to 122º F (-20 to 50º C) Humidity 0 to 95% relative humidity, non-condensing 58

63 LR-300 Quick Reference LR-300 Front 3.5mm Input Jack: A Listen earpiece or headset connects here. LED: When lit, indicates unit has power. On/Off and Volume control dial LR

64 LR-300 Quick Reference LR-300 Inside Access Door LR-300 Top of Unit Battery Select Switch SEEK button: Allows the user to change channels or to lock on a channel. LED indicators: Steady Red: Normal operation Slow Flashing: Battery is low Slow Flashing while charging: Unit is charging SQ Switch LR-300 Battery Select Switch: Place in NiMH position ONLY if you are using Nickel Metal Hydride batteries, otherwise, leave it in the Alkaline position. SQ Switch: Shipped in the ON position, use a screwdriver or pen to slide to the OFF position if needed. You should turn SQ off if any of your receivers do not have SQ. 3.5mm Input Jack: A Listen earpiece or headset connects here. ON/OFF and VOLUME control dial: Rotate the dial counter-clockwise to turn unit on and increase volume. 60

65 LR-300 Setup Instructions 1 2 Remove the product Remove outer packaging and plastic cover. Inspect for physical damage. If damage is apparent, please contact Listen Technologies Corporation technical support for assistance. See page 89 for contact information. Open the front access door If locked, use a pocketknife or small screwdriver to unlock the door locks on both sides of the unit. To unlock the door, rotate the lock ¼ turn counterclockwise. Grip the two tabs with your thumb and index finger and pull the door downward. DO NOT place batteries in the unit yet. 3 Select Battery Type See diagram on page 60. You have two choices: NiMH and Alkaline. The unit is shipped with the switch in the Alkaline position. Use a pen or small screwdriver to select the battery type. Unlocked Locked LR-300 CAUTION: If you are using any battery type other than rechargeable Nickel Metal Hydride (NiMH) batteries, make sure the BATTERY selection switch is in the alkaline position. 61

66 LR-300 Setup Instructions 4 5 Set SQ switch The SQ switch is inside the battery compartment next to the Battery Select switch. The unit is shipped with SQ in the ON position. To turn it off, use a small screwdriver or pen to slide the switch to the OFF position (to the right). See page 75 for more information on SQ. Place Batteries in Unit Place two AA batteries in the compartment, making note of the battery polarity shown in the battery compartment, and again verifying that the BATTERY SELECT switch is in the correct position for the batteries you are using. (ALK should be selected for all battery types other than NiMH). NOTE: Listen provides industrial strength AA alkaline batteries (part number LA-361) and high performance AA Nickel Metal Hydride batteries (part number LA-362). These may be purchased from your Listen dealer. LR Connect an Earphone or Headset Your headset or earphone will connect to the jack on the top of the unit. Either mono or stereo connectors may be used with a Listen receiver. Make certain you push the plug all the way into the jack. Turn the Unit On Receivers are turned on by rotating the volume dial counterclockwise. The red LED on top of the unit should activate. If it does not, make sure you have installed the batteries correctly and that you are using fully charged batteries. 62

67 LR-300 Operation Instructions 1 2 Make Sure the Unit is On Rotate the volume knob counterclockwise with an earphone or headset connected to the unit. Listen receivers use the cable of the earphone or headset as a receiving antenna. Be careful when turning the unit on - if you turn the knob too far you might get too much volume in your earphone! Find an audio transmission using SEEK To find a channel on the LR-300 use the SEEK button. When you do this, the Listen receiver looks for the next active channel. Sometimes the unit will mistake interference for a real broadcast signal. If you get interference, press the SEEK button again. The unit may stop on a channel that is close to the actual broadcast channel, in which case the channel will sound noisy or distorted. Simply press SEEK again until you find the clearest operating channel. 3 4 Test the audio If a transmitter is broadcasting on that channel, you will be able to hear the audio. If the signal is too weak, the audio will be muted (squelched). Adjust the volume control Use the control dial on the top of the unit to adjust the volume to a comfortable level. LR

68 LR-300 Operation Instructions 5 To Lock into Only One Channel Press and hold the SEEK button for 5 seconds to lock a receiver onto the currently tuned channel. Press and hold the button again to unlock. When locked the LED on top of the unit will flash when you press the SEEK button. IMPORTANT: Because the LR-300 has no LCD display, it is important to recognize when the unit is locked on a channel. If the unit sounds distorted or there is no audio heard and pressing the seek button does not correct the problem, the unit is probably locked on the wrong channel. Press and hold the seek button for 5 seconds to unlock. If locked, LED flashes on all portable receivers when SEEK button is pressed. LR

69 LR-300 Charging Batteries The LR-300 and all Listen receivers are unique because they have SmartCharge chargers built in. When any of these units are connected to an LA-202 wall transformer or dropped into a Listen charging case, NiMH batteries will be charged. Connect LA-202 here and plug it into an AC wall outlet. To charge the batteries using the LA-202 wall transformer, plug the transformer into the jack marked PWR/CHG on the side of the unit. The unit can be operated while the batteries are charging. To charge the batteries using a drop-in charger, simply place the unit into a slot in the charger and connect the charger to power. Make sure the unit is fully seated in its slot. One of several charging cases available from Listen. Check the Listen website for more details ( SmartCharge uses a pulse charging, which greatly extends the life of Nickel Metal Hydride (NiMH) batteries. The entire charging process takes 13 hours. Listen recommends that you allow the charger to complete its full cycle every time for maximum battery life. IMPORTANT: DO NOT ATTEMPT TO CHARGE ANY TYPE OF BATTERY OTHER THAN NiMH (NICKEL METAL HYDRIDE) with your Listen equipment. Alkaline batteries may explode when connected to a charger. Other risks of charging non-nimh batteries include destruction of property or fire. LR-300 IMPORTANT: In order to charge NiMH batteries, the BATTERY SELECT switch in your Listen product must be set to the NiMH setting. Use a pen or small screwdriver to move the switch (located in the battery compartment) to the proper position. 65

70 LR-300 Charging Batteries During the charge cycle, the red LED on top of the Listen product will flash slowly. When charging is completed, the LED will turn off. It is not necessary to unplug the charger; however, if you unplug the unit from the charger and then plug it back in, it will begin the 13-hour charge cycle over again. When not using the LR-300, it is recommended to leave the unit on the charger. The charger provides a maintenance charge that keeps the battery at 100%. If the unit is not on the charger, the battery will lose up to 20% of its charge per month. NOTE: Listen provides high performance constant current NiMH (Nickel Metal Hydride) batteries. These may be purchased from your Listen dealer (ask for part number LA-362). LR-300 One of several charging cases available from Listen. See the for more options. LA unit Drop In Charging Case shown 66

71 LR-300 Wall Transformer Operation The LR-300 will operate normally when connected to a wall transformer. Use Listen part number LA-202, available from any Listen dealer. Connect the wall transformer to the jack on the side of the LR-300 marked PWR/CHG and plug the wall transformer into a grounded AC outlet. You do not need to have batteries installed in the LR-300 to operate it with a wall transformer. NOTE: If batteries are in the unit ensure that the battery selection switch is set properly as shown on page 60. Please review the information on page 65 for important information regarding battery type and charging. The LA-202 wall transformer plugs into the side of your portable transmitter or receiver. LR

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